//
// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
//


//
// Common headers used both in smgen.exe and the JIT.
//

#ifndef __sm_common_h__
#define __sm_common_h__

#include "smopenum.h"

#define NUM_SM_STATES 250 

typedef BYTE SM_STATE_ID;

static_assert_no_msg(sizeof(SM_STATE_ID) == 1); // To conserve memory, we don't want to have more than 256 states.

#define SM_STATE_ID_START   1

static_assert_no_msg(SM_STATE_ID_START == 1);  // Make sure nobody changes it. We rely on this to map the SM_OPCODE
                                   // to single-opcode states. For example, in GetWeightForOpcode().

struct JumpTableCell
{
    SM_STATE_ID  srcState;    
    SM_STATE_ID  destState;
};

struct  SMState
{
    bool           term;                 // does this state terminate a code sequence?    
    BYTE           length;               // the length of currently matched opcodes
    SM_STATE_ID    longestTermState;     // the ID of the longest matched terminate state

    SM_STATE_ID    prevState;            // previous state
    SM_OPCODE      opc;                  // opcode that leads from the previous state to current state

    unsigned short jumpTableByteOffset;
};


//
// Code sequences
//

#define MAX_CODE_SEQUENCE_LENGTH  7
#define CODE_SEQUENCE_END         ((SM_OPCODE)(SM_COUNT+1))


#endif /* __sm_common_h__ */


